Web-feeding mechanism



Feb. 15)

J. K. ROBERTSQN ET AL was FEEDING nscnmxsu- Filed Dec. 6, 1923 Patented Feb. 15 1927.

JAMEsjKYrE .noiana'rson Ann .SAMUEL- D ERDENQQE WHITEHALL, narsroni ENGLAND! WEB-FEEDING. MECHANISM."

This. invention relates. to a .device or mechanism. for automatically ad ustings and controlling the running ofsv a. previously.-v

printed, or recurrently and. spacedly+marked and. re-wound,i web of material,..such asa reel-. of tpaperor cardboard, whereby con? tinuous accurate registermt the recurring:

Iti'is found, when. aucontinuous web..of..

material; suchas -paper; is printed or spacecL ly marked. and rewound into reel iform, .o'wing zto.the-flexibility or' elasticity:- of the material; combined with the varying. tension. exerted thereon. to: suitably rewind same, the. relative positioni ofTthe recurring marks. or. imprintsi vary irregularlyfrom their. origi 'nal spaced positions andif'when suchfprevie ously printediorimarked reel of paper issub sequently used in automatic machines- (such-- as, for instance; a: continuousraction i paper. bag-making machine) 1 the position of the imprint or mark isifcontinuously. and. irregu.-

larly varying from its required position rel-ative to the foldingrmech anism of suchb'ag making machine. I v, i I

. It is -a lso. extremely: ditfi'cult;v owing to; knowrrand unavoidable;discrepancies dueito workmanship,- material and Wear, wherever absolute; register is zrequirech .t 0 sovadj ust or time: a supplementary;automatic 1 machine to operate accurately in required step or pitch witlr the originalflprin ting or marking; ma-

chines V I Itiis-theobject 5 of this invention to provide means for automatically: keeping the im- I prints or spaced 1 marks (which; owing to the causes before ment1oned,- have become slightly and irregularlydisplaced from' their original spaced pitch or step during 1 the rewinding process) consecutively in register with definite: timed operatiensi of the bag-1 makingor other machine.

To this end; and lto: enable us :to arrive at our. objective,v it is necessary.- that one or:v more. perforations be made' in the-web of paper or: other material in. suitable posii 1 tion relative to each consecutive imprinti or mark; and suclv perforation; must; be 1 made in the-wcbof m-aterial at thesame timepor. during the process of; the imprint: or mark being placed thereon, andalways previous to the-:rewinding of suchweb into reelform.

prisingia. pair :otirollersaadapted tov-gripethe 185 webg oneioiiiwhich .is provided with .pins, jand; means wherebyatdntervailsthe pair ofirollers doesn'ot grip? the web; a second. ifOllGliOlffPfllIfi' of rollers which: i s adapted ,Eto :fe'ed .Ethe webv: to the. pin roller. at a slightly. faster rate than the" web-is passed'by the p-i-nerollerp; means .being. provided wvhereby at intervals 7 thGE SGCOIlCiPfllI' of rollers does; not gripi-the web .and. a third: roller; or pair) of rollers.

adapted .to.v grip the weld when the. first-mens e tioned pair. of rollersdoes: not grip-inorder: to take .upthe tensionfproducedi by any other operations.

In one-example .showingnthesmanneri inwhichouridevice onmechanism -m-ay.be.con-... so

structedxand'. operated; we proceed itoidescri'bei and; explain'i same working in. conj unction. with. a well-known. type 'Of"lCOI1tll111Ql1S.-I- action paper bag making. machine, aswillustratedu in; the; accompanying drawing; which 1 is a; diagrammatic side: elevation, but .it :emust.

be clearly. understood ithat. we do notgcon-fine. or limit ourselves-toasuch applicationpas.the.

/ invention. is-obviously: applicable; tOi a very wide range-and variety of automatic paper: so and; cardboard, and tsimilar: material hans dling.:macl1inery.. I

Theedevice' or! mechanism is placed in any; suitable position ialongithepath of travel 0f: the-paper.;web a-tromits reelwb to thedraw rollers. act the .bagemaking machine and for, convenience may-she placed just previous to th ecommencement of the formation l Ofi the paperewebdntovits required tubemform and.-

the device: must ..''be suitably ancl{defi'11itel-y m 1 driven. from.=. some shaft on @the; -bag making..

machine whereby the imprint adjusting' de-' vicer. m:ay. be drivenor, operated: in step. or g pitch with the folding mechanism oftlthet bag making machine. drivingshaft: is indicated. at? 6Z and this shaftidrives therollerse and the rollers f5 9,: h and which arewgearedtheretom The shaft: d is positively driven from somesuitable shaft of the bag-making machine. 1

Iii the example; the;.105

The imprint adjusting mechanism comprises a number ofrollers e h with less than a complete surface tread working 111 con unc- .tion with othercomplete tread rollers f g arranged to draw the web'of paper a, from the reel 6 in such a manner as to ensure that the projecting tapered pins j carried by one g of the rollers g it shall always enter the holes or perforations previously made in the web at the time the imprint was made thereon, which object is attained by drawing'the web of paper by a pair of rollers g b one of which carries the pins j intended to enter the perforations, and feeding the web of paper at, a slightlylaccelerated rate of feedv towards such pins by the rollers e f so as to ensure the pins having a sufficient surplus supply of paper to adjust themselves accu-= rately intheperforations without strain. or

tension and passing such adjusted paper along by means of the pins through the cut awayportion of the tread of one it of the first mentioned pair of rollers g h after passing the centre of which the tread immediately follows and again grips the paper web,

the feed acceleration roller 6 then ceases to act for the cut away portion of its surface, thus enabling whatever surplus feed of paper remains to be immediately absorbed. It is also necessary to provide a further segmental gripping roller z arranged to control the paper web during the time the pins j are "carrying the adjusted web into the grip of the draw rollers 9 hot the device, so as to V prevent any strain or tension from the draw rollers 0 of the bag-making machine acting upon the leading portion of the' web of paper, and thereby tearingor distorting the adjustment or register already obtained, until the cut away portion of the draw roller It has passed and the tread again grips the web immediately following the passing of the. adjusting pins 7'. Thus it will be clear that we employ equivalent to three pairs of rollers, each pair acting or gripping the web of paper for a portion of the revolution only, but one or other pair of rollers has successive control of the paper web during its passage through the adjusting device or mechanism. The segmental excess feed roller 6 is slightly I larger in diameter than the other two seg- 7 mental rollers h 2' which latter are of a circuinference approximately equivalent to. the length of paper between each successive point ofimprint or perforation originally made'on the web of paper. It may be convenient to arrange the roller 9 carrying the adjusting pins y to. be of a circumference equal to a multiple of the circumference of the two segmental rollers-h z in which case [we find it convenient to arrange the two segmental rollers of'equal circumference to operate in unison'with the large pin carrying roller 9' and thus save the equivalent of a 6 separate roller, the pin-carrying roller and the two segmental rollers thus acting equivalent to two separate pairs of rollers.

It must be understood that in order to achieve our object it is necessary to so adjust the draw rollers c of the bag-making machine that they (if otherwise uncontrolled) would draw a slightly longer length of paper web than the imprint-adjusting device (including whatever slight additional length of web may be passed in the adjustment process) supplies to them, this slight restriction of supply to the bag-making machine serving the double :purpose of providing sufficient tension or pull action between the adjusting device and the bagmaking machine draw rollers'to allow the paper web to be satisfactorily formed into the required tube form and also ensures the o reliable absorption of all the paper supplied by the adjustingdevice which, within narrow limits, is somewhat of an irregular length. We utilize the facts that the paper is flexible or elastic and also that it can readily be made to slip slightly in the draw rollers of the bag-making machine without actual damage to the web of paper, and the utilization of these-characteristics in conjunction with the. mechanism or device described enables us to obtain continuous and accurate adjustment of the imprint relative to the bag-feeding mechanism of o the bag-making machine.

Although segmental rollers are, described, it is clearly understood that the same re-V sults of releasing the grip on the paper could be obtained by lifting the rollers apart at predetermined times by means of cams or other mechanism.

Or other intermittent gripping and re the course of, subsequent operations, that is to say, th e material is fed under tension or pull action effected by the mechanism performing subsequent operations.

What we ClEIlID'flHCl desire to secure by e Letters Patent is :j

1. In, or in connection with, a paper bagmaking or other machine and its mecha nism for automatically adjusting and con trolling the running of a previously-printed or recurrently-V and spacedly-marked and rewound web of material by means of tapered v pins which are mounted on one of a pair of rollers and adapted to fit into, and thereby regulate the position of, holes or apertures previously spaced equidistantly in the web of material, a device for intermittently gripping the web of material between the said 1 mechanism and the origin of the said pull to create a web. slack, thereby permanently maintaining the web of material in the mechanism in an unstrained condition, draw rolls tending to maintain a constant tension on said rolls first mentioned and intermit tently operating means located between said drawing rolls and said rolls first mentioned for releasing the tension of the draw rolls on the rolls first mentioned.

2. In, or in connection with, a paper bagmaking or other machine and its mechanism for automatically adjusting and controlling the running of a previously-printed or recurrentlyand spacedly-marked and rewound web of material by means of tapered pins which are mounted on one of a pair of rollers and adapted to fitinto, and th-ereby'regulate the position of, holes or apertures previously spaced equidistantly in the web of material having a surplus of material adjacent to, and loose between, the said rollers at the point when the pins enter the said apertures, the provision of a'pair of rollers having on the periphery of one a cam whose surface is adapted to bear upon the material passing between, and throughout that period during which, the pins enter and adjust the position of the holesin the material, and during which the material is loose between the rollers upon which the pins are mounted,

draw rolls tending to maintain aconstant JAMES KYTE ROBERTSON. SAMUEL nUERDnv. i 

